Re: NCR53c720

[Rene B. <re...@we...>]

Hello!

On 2003.09.30 16:32 Matthew Wilcox wrote:
> On Tue, Sep 30, 2003 at 03:59:32PM +0200, Rene Brothuhn wrote:
> > but the 720/770 registers are slightly different.
> > Is the NCR_Q720 or zalon driver working?
>=20
> Yes, they're both working fine.
>=20
> I went over the 770 register definitions the other night and only found
> one difference between the names of the definitions in the sym53c8xx_de=
fs
> file and the 770 PDF and that was:
>=20
> -/*3a*/  u_char    nc_sbr;
> +/*3a*/  u_char    nc_sbr; /* dwt on 720 */
>=20
> This is the DMA watchdog timer, but it's not actually used by the drive=
r.
> It's a `scratch byte register' on the 895.  Some of the `reserved'
> fields in the 770 register definition have names, but they were only
> ever touched if the chip was a sufficiently recent revision.
>=20
> BTW, I couldn't see a document for the 720 chip on the LSI site -- only
> the 710 and 770.  I presume I won't go far wrong treating them the same=
.

Sorry for reacting so late. I also have no doc for the 720, but I think=20
the differences between 770 and 720 are not so big.
I'm sure there are a lot more differences between the 8xx and 720/770. No=
t=20
only the registers or register names but also the bits inside some=20
registers are slightly different.
I have some PDF's on which the differences between the chips are=20
described. It seems that these docs are not available anymore on the LSI=20
site. I'll send it directly to you, because the size is to much for the=20
list.
I hope this will help you.

I have looked into the driver a little bit last weekend and I guess it=20
should be possible to provide a 770 definition into the driver. But first=
=20
I have to got a workable 2.6 kernel...


Ciao, Ren=E8